Code
P04E5
Generic
P — Powertrain
EGR Temperature Sensor D Circuit
Views:
UK: 15
EN: 27
RU: 15
AI status
Completed
Completed
100%
Causes
- Open or short in the EGR temperature sensor D wiring harness
- Corroded, damaged or disconnected sensor connector
- Failed EGR temperature sensor (thermistor or thermocouple)
- Poor ground or reference voltage to sensor
- Contamination or heat damage to the sensor (soot, oil, exhaust corrosion)
- PCM/ECM internal fault or poor connector at PCM
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Possible reduced engine performance or limp mode if PCM limits EGR
- Poor idle or rough running (depending on control strategy)
- Reduced fuel economy and higher emissions
- Failed emissions test
- Freeze-frame data stored
What to check
- Visually inspect sensor, wiring harness and connector for damage, corrosion, heat or soot contamination
- Verify connector is fully seated and locking tab engaged
- Check for continuity and shorts between sensor signal, sensor ground and vehicle battery positive (VB) or reference circuit
- Read live data / freeze frame for EGR temp D; verify value is plausible and changes with engine warm-up or by applying heat to sensor
- Measure sensor resistance (if thermistor) or voltage/millivolt output (if thermocouple) and compare to expected values
- Wiggle test wiring and connectors while monitoring live data to find intermittent faults
Signal parameters
- Sensor type varies by manufacturer: either NTC thermistor or thermocouple. Consult OEM spec.
- Typical NTC thermistor resistance examples (approximate): ~10 kΩ at 25°C; resistance decreases as temperature rises. Exact values vary by sensor
- Typical thermocouple output (if used): millivolt-level signal that increases with temperature (tens to hundreds of mV at high EGTs). Consult OEM reference.
- Reference/supply voltage (if applicable): often ~5.0 V reference from PCM; signal voltage commonly 0.1–4.9 V depending on temperature and sensor type
- Allowable circuit resistance to ground: short to ground < 5 Ω, open circuit infinite — check against OEM limits
Diagnostic algorithm
- Retrieve freeze-frame and live data. Note EGR temp D reading at key conditions (cold start, idle, after warm-up).
- Perform visual inspection of the EGR temp D sensor, harness and connector for heat damage, soot build-up, corrosion, pin push-out or broken wires. Repair physical damage first.
- Clear codes, run engine and observe live data. If code returns immediately, suspect wiring/short or supplier reference fault.
- Back-probe sensor connector. With ignition ON (engine OFF), check for reference voltage (often ~5 V) between reference pin and ground if the sensor requires a supply. If no reference, check PCM output and related fuses/relays.
- With engine at ambient, measure sensor resistance (for thermistor) between sensor pins and compare to OEM chart. Heat sensor gently (propane torch with caution or heat gun) and watch resistance/voltage change—should move smoothly.
- If sensor is thermocouple type, measure millivolt output while heating—voltage should rise predictably with temperature.
- Check for short to ground or battery by measuring continuity between signal wire and ground or between signal wire and VB. Repair shorted/open circuits.
- Perform wiggle/stress tests on harness and connector while watching live data to find intermittent faults. Repair broken wires or poor crimps.
- If wiring and connector correct, replace the EGR temperature sensor and re-test. Use OEM or equivalent sensor.
- If problem persists after replacing sensor and repairing harness, test or replace PCM only after confirming all circuit integrity and consulting OEM procedures.
Likely causes
- Wiring damage at harness near EGR cooler/manifold (vibration/heat rubbing)
- Connector corrosion or pin/backside contact failure
- Failed EGR temperature sensor (most common)
- High-resistance ground or open reference supply
- Less likely: PCM fault
Fault status
Status
Stored when the PCM detects an open, short, or implausible signal from the EGR Temperature Sensor D circuit. The fault may set the MIL and log freeze-frame data; EGR function or emissions control may be limited.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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